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#21
The Notebook I mentioned earlier in this thread came with Vista, I Upgraded it to Win7, installed SP1 then used the referenced method to further Upgrade to Win10 and Win10 never asked for the Product Key from Win7. The final reboot of the installation showed Win10 as Activated.
I noticed one difference from earlier Upgrades, the install.esd file at 2.9GB is a few hundred MB smaller than what I'd saved on those other computers.